I need help finding T stat, P, and intervel

Listed in the data table are IQ scores for a random sample of subjects with medium lead levels in their blood. Also listed are statistics from a study done of IQ scores for a random sample of subjects with high lead levels. Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. Complete parts (a) and (b) below.

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a. Use a 0.01 significance level to test the claim that the mean IQ scores for subjects withmedium lead levels is higher than the mean for subjects with high lead levels.

What are the null and alternative hypotheses? Assume that population 1 consists of subjects with medium lead levels and population 2 consists of subjects with high lead levels.

data: Medium Lead Level

High Lead Level

72

81

92

85

88

97

83

92

101

111

91

n2

=11

x2=87.745

s2=10.205